1*1w led down light 1,Cree, Epistar 2,90-120lm/w,1/3/5/7/9/12/15/18w 3,CE& ... is very short,ceiling light with too bad brightness can not achieve focus lighting effectsRadiator solution:the mains way of an overall heat sink ... together with the design determine the efficiency of the transformer,also power factor,stability,temperature rise and lifeUsers do not understand the knowledge of components ...